转自：http://www.cnblogs.com/yzst/archive/2011/10/31/2229768.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
body{
background:#fff;
font:13px/1.5 Arial, Helvetica, sans-serif;
margin:0;
padding:0;
}
.rounded{
background:#aaa url(images/lt.gif) top left no-repeat;
width:100%;
}
.rounded h2{
background:url(images/rt.gif) top right no-repeat;
padding:20px 20px 10px;
margin:0;
}
.rounded .main{
background:url(images/r.gif) top right repeat-y;
padding:10px 20px;
margin:-2em 0 0 0;
}
.rounded .footer{
background:url(images/lb.gif) bottom left no-repeat;
}
.rounded .footer p{
color:#888;
text-align:right;
background:url(images/rb.gif) bottom right no-repeat;
display:block;
padding:10px 20px 30px;
margin:-2em 0 0 0;
}
#header,#center,#pagefooter{
width:800px;
margin: 0 auto;
}
#left{
float:left;
width:50%;
}
#content{
float:left;
width:49%;
}
#side{
width:49%;
}
</style>
</head>
<body>
<div >
<div >
<p>
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</div>
</div>
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</body>
</html>